US9456536B2 - Method for pins detection and insertion of electronic component - Google Patents
Method for pins detection and insertion of electronic component Download PDFInfo
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- US9456536B2 US9456536B2 US14/074,960 US201314074960A US9456536B2 US 9456536 B2 US9456536 B2 US 9456536B2 US 201314074960 A US201314074960 A US 201314074960A US 9456536 B2 US9456536 B2 US 9456536B2
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- 238000003780 insertion Methods 0.000 title claims abstract description 54
- 230000037431 insertion Effects 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000001514 detection method Methods 0.000 title claims abstract description 41
- 238000012545 processing Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/08—Monitoring manufacture of assemblages
- H05K13/081—Integration of optical monitoring devices in assembly lines; Processes using optical monitoring devices specially adapted for controlling devices or machines in assembly lines
- H05K13/0812—Integration of optical monitoring devices in assembly lines; Processes using optical monitoring devices specially adapted for controlling devices or machines in assembly lines the monitoring devices being integrated in the mounting machine, e.g. for monitoring components, leads, component placement
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/0015—Orientation; Alignment; Positioning
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/08—Monitoring manufacture of assemblages
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/306—Lead-in-hole components, e.g. affixing or retention before soldering, spacing means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49004—Electrical device making including measuring or testing of device or component part
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/53—Means to assemble or disassemble
- Y10T29/5313—Means to assemble electrical device
- Y10T29/53174—Means to fasten electrical component to wiring board, base, or substrate
Definitions
- the disclosure relates to pins identification and insertion technologies, and in particular, to a method and system for pins detection and insertion of an electronic component.
- production of electronic products includes the steps of component assembly, mechanism assembly, testing and delivery.
- Components in the component assembly are classified to surface mount devices (SMDs) and dual-in-line packages (DIPs).
- SMDs surface mount devices
- DIPs dual-in-line packages
- the SMD becomes the priority for component packaging.
- components used for high-voltage and large-current products must be packaged through DIP.
- the SMD component has a fixed size and is easy to pick and place automatically, so a lot of devices thereof are available and little manual labor is required.
- the appearance and size of the DIP component vary a lot, and the DIP component is difficult to pick and place. Therefore, few devices thereof are available, and great manual labor is required.
- a cutting process is first performed to form independent electronic components, and then the electronic components are transported to a tray for bearing electronic components and arranged in sequence. Then the electric component is picked by a robotic arm in an automatic manner, and an insertion process is further performed to insert the electronic component to a corresponding position on a circuit board.
- positions of pins of the electronic component are detected through image processing in the known art, so as to estimate whether the positions of the pins exceed an allowable insertion range.
- the electronic component may have problems such as an uneven surface or an error in the length of the pins, or the pins are deformed or bent as the electronic components push and squeeze each other during packing and delivery. All these situations affect a subsequent judgment result of whether the electronic component is qualified for the insertion process.
- the disclosure provides a method for pins detection and insertion of an electronic component, comprising: picking an electronic component having a first pin and a second pin by a pick and place device; acquiring a plurality of serial images with respect to the first pin and the second pin at different height along an image acquiring direction by an image acquiring device; separately detecting image positions corresponding to the first pin and the second pin in the plurality of serial images; determining whether the electronic component is qualified according to a distance between the image positions of the first pin and the second pin; and if the electronic component is qualified, inserting the electronic component to a circuit board according to a position relationship between the image positions of the first pin and the second pin and a geometric center position of the pick and place device.
- the disclosure further provides a method for pins detection and insertion of an electronic component, comprising: picking an electronic component having a plurality of pins by a pick and place device; acquiring a plurality of serial images with respect to the plurality of pins at different height along an image acquiring direction by an image acquiring device; separately detecting image positions corresponding to the pins in the plurality of serial images; determining a position state according to the image positions of each pin, so as to determine whether the electronic component is qualified, and if the electronic component is qualified, inserting the electronic component to a circuit board according to a position relationship between the image positions of the pins and a geometric center of the pick and place device.
- the disclosure provides a system for pins detection and insertion of an electronic component, comprising: an image acquiring device; a pick and place device, used for picking an electronic component having a first pin and a second pin; and a control unit, electrically connected to the pick and place device and the image acquiring device, wherein the control unit controls the image acquiring device to acquire a plurality of serial images with respect to the first pin and the second pin at different height along an image acquiring direction, and separately detects image positions corresponding to the first pin and the second pin in the plurality of serial images; the control unit then determines whether the electronic component is qualified according to a distance between the image positions of the first pin and the second pin, and if the electronic component is qualified, controls the pick and place device to insert the electronic component to a circuit board according to a position relationship between the image positions of the first pin and the second pin and a geometric center of the pick and place device.
- the disclosure provides a system for pins detection and insertion of an electronic component, comprising: an image acquiring device; a pick and place device, used for picking an electronic component having a plurality of pins; and a control unit, electrically connected to the pick and place device and the image acquiring device, wherein the control unit controls the image acquiring device to acquire a plurality of serial images with respect to the plurality of pins at different height along an image acquiring direction, and separately detects image positions corresponding to the pins in the plurality of serial images; the control unit then determines a position state according to the image positions of each pin so as to determine whether the electronic component is qualified, and if the electronic component is qualified, controls the pick and place device to insert the electronic component to a circuit board according to a position relationship between the image positions of the pins and a geometric center of the pick and place device.
- FIG. 1 is a schematic flow chart of a method for pins detection and insertion of an electronic component according to an embodiment of the disclosure
- FIG. 2 is a schematic view of an embodiment of an insertion system of an electronic component
- FIG. 3 is a schematic view of another embodiment of an insertion system of an electronic component
- FIG. 4A is a schematic flow chart of a first embodiment for detecting image positions corresponding to the first pin and the second pin according the disclosure
- FIG. 4B is a schematic flow chart of a second embodiment for detecting image positions corresponding to the first pin and the second pin according the disclosure
- FIG. 5A is a schematic view of detecting an interest region through projection
- FIG. 5B is a schematic view of detecting an interest region through geometric matching
- FIG. 5C is a schematic view of detecting an interest region through pattern matching
- FIG. 6A to FIG. 6B are schematic views of interest images of the serial images according to the disclosure.
- FIG. 7 is a schematic view of a relationship of pin images in an overlapped image
- FIG. 8 is a schematic flow chart of inserting the electronic component to a circuit board according to a position relationship between the first and second pins and the geometric center of the pick and place device in accordance with the disclosure;
- FIG. 9A to FIG. 9C are schematic views of position relationships between pins of a qualified electronic component and a pick and place device
- FIG. 10A is a schematic flow chart of a method for pins detection and insertion of an electronic component according to another embodiment of the disclosure.
- FIG. 10B is a schematic view of an electronic component having multiple pins
- FIG. 11A is a schematic flow chart of an embodiment for detecting an image positions of each pin according to the disclosure.
- FIG. 11B is a schematic flow chart of another embodiment for detecting an image positions of each pin according to the disclosure.
- FIG. 12A is a schematic view of an interest region of each serial image
- FIG. 12B and FIG. 12C are schematic views of edge shapes of pins in a combined image
- FIG. 13A and FIG. 13B are schematic views of an edge contour of a pin
- FIG. 14A is a schematic view of a bottom image of an electronic component having a plurality of non-circular pin contours.
- FIG. 14B is a schematic view of compensation according to a position relationship.
- the disclosure provides a method and system for pins detection and insertion of an electronic component.
- the method includes acquiring serial images with respect to pins of an electronic component at different height as height of the electronic component changes, separately detecting pin images with a largest area in the serial images, and then detecting a geometric center of the pin image with a largest area to determine whether a pin position is abnormal.
- the method of the disclosure analyzes pin deformation of the electronic component, or problems of uneven length and an uneven surface on the image intensity after a cutting process, so as to reduce the insertion error of the electronic component on a circuit board and improve the yield of insertion.
- FIG. 1 is a schematic flow chart of a method for pins detection and insertion of an electronic component according to an embodiment of the disclosure
- FIG. 2 is a schematic view of an insertion system of an electronic component.
- the process in FIG. 1 is controlled by a control unit 36 .
- the control unit 36 may be a processor having an operational capability, such as a computer, a server or a programmable logic controller (PLC).
- the method 2 includes the following steps: In Step 20 , a pick and place device 30 picks an electronic component 31 .
- the electronic component 31 is a DIP electronic component and has a first pin 310 and a second pin 311 .
- the electronic component 31 is disposed on a bearing tray 38 .
- the pick and place device picks the electronic component 31 from the bearing tray.
- the first pin 310 and the second pin 311 each have an extending direction, which is a direction Z in this embodiment.
- an image acquiring device 33 acquires a plurality of serial images 34 with respect to the first pin 310 and the second pin 311 at different height along an image acquiring direction (which is an axial direction Z in this embodiment).
- the image acquiring direction is substantially parallel to the extending direction of the first pin 310 or the second pin 311 .
- the serial images are images of pins of the electronic component 31 sequentially picked by the pick and place device 30 when the height of the electronic component 31 increases or decreases on the axis Z. Therefore, each image in the plurality of serial images corresponds to respective height.
- the images correspond to different height are all in a depth of field range where the image acquiring device can acquire clear images.
- Step 21 acquiring the plurality of images of the pins, namely, the serial images 34 may be implemented in two manners.
- One implementation manner is shown in FIG. 2 .
- the image acquiring device 33 is directly disposed below the bearing tray 38 , so when the pick and place device 30 picks or attracts the electronic component 31 from the bearing tray 38 , the image acquiring device 33 acquires pin images at different height Z during a rising process, so as to form the plurality of serial images 34 corresponding to different height.
- an annular light source 32 is further disposed at a corresponding picking or attraction position.
- the annular light source 32 has an annular body 320 , and a plurality of light emitting components 321 , such as light emitting diodes, in annular arrangement is disposed thereon.
- the annular body 320 has a hollow portion 322 .
- An axis when pick and place device 30 picks the electronic component 31 and rises may correspond to a center of the hollow portion 322 .
- the light emitting components 321 in annular arrangement may evenly illuminate the first pin 310 and the second pin 311 below the electronic component 31 around 360 degrees.
- the position of the annular light source 32 may be above or below the image acquiring device 33 , and is not limited to the embodiment shown in the figure.
- the light source is not limited to the annular light source shown in FIG. 2 . Other proper light sources can be selected according to requirements.
- the image acquiring device 33 and the annular light source 32 are disposed on a specific position of a path along which the pick and place device 30 moves to a circuit board 35 .
- the pick and place device 30 may further move downward or upward to generate different height on the axis Z, so that the image acquiring device 33 acquires images with respect to the first pin 310 and the second pin 311 of the electronic component 31 , thereby generating a plurality of serial images 34 .
- the images may be picked when the pick and place device 30 moves downward or upward.
- Step 22 image positions corresponding to the first pin and the second pin are separately detected in the plurality of serial images.
- a first pin image with a largest area and a second pin image with a largest area are separately detected in the plurality of serial images.
- the first pin image with a largest area and the second pin image with a largest area do not necessarily appear in the same serial image.
- FIG. 4A is a schematic flow chart of a first embodiment for detecting image positions corresponding to the first pin and the second pin according to the disclosure.
- Step 220 an interest region corresponding to the first pin and the second pin is determined in each serial image. The interest region may be found through projection, geometric matching or pattern matching.
- FIG. 5A is a schematic view for detecting an interest region through projection.
- An image 340 represents each of the serial images.
- each pixel may be used as an interval unit of an axial direction X and an axial direction Y to accumulate gray scale values of the image in the axial direction X and the axial direction Y, forming a state shown in a curve 93 and a curve 94 .
- Approximate positions of the first pin image 310 a and the second pin image 311 a are determined through finding peak values of the curve 93 and the curve 94 , thereby further determining an interest region covering the first pin image 310 a and the second pin image 311 a .
- FIG. 5B FIG.
- 5B is a schematic view of geometric matching.
- samples 91 corresponding to different sizes of sections of the pins are used to detect positions corresponding to the pin image 310 a and the pin image 311 a in each serial image 340 .
- pattern matching may be used for searching.
- combination samples 92 of sections of the first and second pins with different sizes, distances and angles are used to compare with the first pin image 310 a and the second pin image 311 a in each serial image 340 , so as to determine approximate positions of the first pin image 310 a and the second pin image 311 a , and further determine an interest region covering the first pin image and the second pin image.
- the image position may be represented by X and Y coordinates.
- FIG. 6A is a schematic view of interest images of the serial images according to the disclosure.
- interest regions 90 a to 90 g respectively correspond to the serial images, and a slash part represents a dark area.
- the largest area refers to the number of pixels with brightness greater than a threshold in images corresponding to the first pin and the second pin in the interest region. It should be noted that, in this embodiment, binaryzation processing may be first performed on images in the interest area.
- the binaryzation processing is to compare a gray scale value of each pixel with a threshold value. If the gray scale value exceeds the threshold value, the pixel is a bright spot (with a gray value of 225); if the gray scale value is lower than the threshold value, the pixel is regarded as a dark spot (with a gray scale value of 0). The area of the first pin and the area of the second pin are then determined according to the number of pixels with the gray scale value being 225.
- the area is determined according to a relationship between the gray value and the threshold value, that is, determined according to the number of pixels exceeding the threshold value.
- FIG. 6A is taken as an example in this embodiment.
- the first pin image 310 b in the interest region 90 b and the second pin image 311 c in the interest region 90 d have the largest area, and therefore can be used to represent the first pin and the second pin.
- the characteristic of this embodiment is that the brightness of the first pin and the brightness of the second pin are separately considered. Therefore, no threshold value needs to be set to select pin images. In this way, good pin images can be acquired, facilitating subsequent determination of the geometric center of the pin, thereby improving the accuracy rate in determining whether an electronic pin is qualified.
- FIG. 7 which is a schematic view of overlapped first pin and second pin, is taken as an example.
- mark number 310 b and mark number 311 c respectively represent the first pin image with a largest area and the second pin image with a largest area detected in Step 221 .
- a geometric center 312 of the first pin image 310 b and a geometric center 313 of the second pin image 311 c are used as image positions of the first pin and the second pin.
- the image position may be represented by X and Y coordinates.
- FIG. 4A shows one implementation manner for detecting image positions of the first pin and the second pin.
- FIG. 4B shows a schematic flow chart of a second embodiment for detecting image positions corresponding to the first pin and the second pin according to the disclosure.
- a largest pin image is formed through superposition.
- Step 220 an interest region corresponding to the first pin and the second pin is determined in each serial image.
- Step 220 a is the same as the foregoing Step 220 , and is not described herein again.
- Step 221 a a first pin image with respect to the first pin is respectively detected in the interest region of each serial image.
- Step 222 a at least two serial images including the first pin images with respect to the first pin detected in the interest regions corresponding to the serial images are selected, and a union operation is performed on the first pin images with respect to the first pin in the at least two images, so as to form a first combined image with respect to the first pin.
- Step 222 a as shown in FIG. 6B , the images with respect to the first pin and the second pin in each interest region are incomplete, and a slash region represents a dark area. Therefore, through Step 222 a , the union operation is performed on the images with respect to the first pin in the interest regions in at least two serial images so as to form a first pin image with a largest area. For example, for the first pin part, the union operation is performed on first pin images in the interest region 90 h and the interest region 90 i , so as to obtain a superposed image with respect to the first pin.
- Step 223 a a second pin image with respect to the second pin is respectively detected in the interest region of each serial image.
- Step 224 a at least two images including the second pin images are selected, and a union operation is performed on the second pin images with respect to the second pin in the at least two images, so as to form a second combined image with respect to the second pin.
- FIG. 6B is used for description.
- the union operation may be performed on second pin images in the interest region 90 j and the interest region 90 k , so as to obtain a superposed image with respect to the second pin.
- Step 225 a a geometric center of the first combined image and a geometric center of the second combined image are separately detected and used as image positions of the first pin and the second pin.
- Step 23 it is determined whether the electronic component is qualified according to a distance between the image positions of the first pin and the second pin.
- the geometric center 312 of the first pin image 310 b and the geometric center 313 of the second pin image 311 c are already determined, so a distance D between the two pins can be determined. If D exceeds or is lower than an acceptable threshold value or range, it indicates that the electronic component 31 cannot be smoothly inserted to a corresponding pin contact 350 on the circuit board 35 , and therefore the electronic component 31 regarded as unqualified in Step 24 and is eliminated. If D is in the acceptable range, it indicates that the electronic component 31 can be smoothly inserted to the corresponding pin contact 350 on the circuit board 35 , and therefore the electronic component is qualified.
- Step 25 the electronic component 31 is inserted to the circuit board 35 according to a position relationship between the image positions of the first pin 310 and the second pin 311 and a geometric center of the pick and place device 30 .
- the center of the electronic component 31 does not always correspond to the center of the pick and place device 30 , and an error may be generated. Therefore, even if D satisfies the determination in Step 23 of FIG. 1 , the insertion may still fail due to an error in the position relationship between the pick and place device 30 and the electronic component 31 . Therefore, in Step 25 , the position relationship between the image positions of the first pin 310 and the second pin 311 and the geometric center of the pick and place device 30 may be compensated, so as to ensure that the electronic component is smoothly inserted to the corresponding circuit board.
- FIG. 8 is a schematic flow chart of inserting the electronic component to the circuit board according to the position relationship between the first and second pins and the geometric center of the pick and place device in accordance with the disclosure.
- a first distance difference ⁇ x in a first axial direction X and a second distance difference ⁇ y in a second axial direction Y are determined according to a center of a connecting line between the image positions of the first pin and the second pin, and the geometric center of the pick and place device.
- Step 251 an included angle ⁇ is determined according to the connecting line between the image positions of the first pin and the second pin, and the second axial direction Y passing through the geometric center of the pick and place device 30 .
- Step 252 the position of the electronic component is adjusted according to the first distance difference ⁇ x, the second distance difference ⁇ y, and the included angle ⁇ .
- FIG. 9A to FIG. 9C are schematic views of position relationships between pins of a qualified electronic component and a pick and place device.
- the position relationship between the pins of the electronic component 31 and the pick and place device 30 may have a single direction shift as shown in FIG. 9A .
- a middle point 314 of the connecting line between the geometric centers of the first pin image 310 b and the second pin image 311 c has a difference ⁇ x in a direction X with the geometric center 300 of the pick and place device.
- FIG. 9A to FIG. 9C are schematic views of position relationships between pins of a qualified electronic component and a pick and place device.
- the position relationship between the pins of the electronic component 31 and the pick and place device 30 may have a single direction shift as shown in FIG. 9A .
- a middle point 314 of the connecting line between the geometric centers of the first pin image 310 b and the second pin image 311 c has a difference ⁇ x in a direction X with the geometric center 300 of the pick
- an angle error exists between the electronic component and the pick and place device, that is, the connecting line between the geometric centers of the first pin image 310 b and the second pin image 311 c , and a reference line passing through the geometric center 300 of the pick and place device 30 and parallel to the axis Y form an included angle ⁇ .
- the connecting line between the geometric centers of the first pin image 310 b and the second pin image 311 c
- the middle point 314 of the connecting line between the geometric centers of the first pin image 310 b and the second pin image 311 c has a difference ⁇ x in a direction X and a difference ⁇ y in a direction Y with the geometric center 300 of the pick and place device 30 ; moreover, the connecting line between the geometric centers of the first pin image 310 b and the second pin image 311 c , and a reference line passing through the geometric center 300 of the pick and place device 30 and parallel to the axis Y form an included angle ⁇ .
- the control unit 36 controls the pick and place device 30 to move to compensate the distance of ⁇ x, so that the pick and place device 30 smoothly inserts the electronic component 31 to the circuit board 35 .
- the control unit 36 controls the pick and place device 30 to rotate to compensate ⁇ degrees, so that the pick and place device 30 smoothly inserts the electronic component 31 to the circuit board 35 .
- the state shown in FIG. 9A the control unit 36 controls the pick and place device 30 to move to compensate the distance of ⁇ x, so that the pick and place device 30 smoothly inserts the electronic component 31 to the circuit board 35 .
- the control unit 36 controls the pick and place device 30 to rotate to compensate ⁇ degrees, so that the pick and place device 30 smoothly inserts the electronic component 31 to the circuit board 35 .
- the control unit 36 controls the pick and place device 30 to move in the direction X and direction Y to respectively compensate the distance of ⁇ x and the distance of ⁇ y, and controls the pick and place device 30 to rotate anticlockwise to compensate ⁇ degrees, so that the pick and place device 30 smoothly inserts the electronic component 31 to the circuit board 35 .
- FIG. 10A is a schematic flow chart of a method for pins detection and insertion of an electronic component according to another embodiment of the disclosure.
- This embodiment is mainly directed to multiple pins such as an electronic component 4 having multiple pins 40 , and to a process of identification and insertion according to pins with different sections.
- the process of Step 20 a and Step 21 a in the method 2 a is the same as Step 20 and Step 21 in FIG. 1 , and is not described herein again.
- Step 22 a an image position of each pin is separately detected in a plurality of serial images.
- FIG. 11A is a schematic flow chart of an embodiment for detecting an image position of each pin according to the disclosure.
- Step 220 b an interest region of the pins is determined in each serial image.
- Step 220 b approximate positions of the pins are detected in each serial image through projection, geometric matching or pattern matching as shown in FIG. 5A to FIG. 5C , so as to determine an interest region.
- Step 221 b a pin image with a largest area with respect to each pin is separately detected in the interest regions of the serial images.
- This step is substantially the same as the manner shown in FIG. 6A , and the different merely lies in that, the number of pins is two in FIG. 6A , and a plurality of pins in two rows exists in this embodiment.
- mark number 90 p to mark number 90 t represent interest regions of the serial images.
- Each interest region has a plurality of pins, and the size of a pin varies in different interest regions, so based on the manner described in foregoing Step 221 , a pin image with a largest area corresponding to each pin is separately detected in the plurality of interest regions.
- Step 222 b edge contour detection is performed on each pin image.
- an edge contour of the pin image with a largest area in Step 221 b is detected.
- Step 223 b a shape of the edge contour is determined.
- the edge contour of each pin in the combined image may be a circle as shown in FIG. 12B , or a polygon as shown in FIG. 12C .
- the polygon is a rectangle.
- Step 224 b is performed, in which geometric centers of the pin images with a largest area are used as image positions of the pins. Step 224 b is the same as the foregoing Step 222 , and is not described herein again. If the edge contour is a rectangle, Step 225 b is performed, in which a plurality of circular images forms a row and is filled in the edge contours corresponding to the pin images. Referring to FIG. 13A and FIG. 13B , FIG. 13A and FIG. 13B are schematic views of edge contours of a pin image 40 a (corresponding to the pin 40 in FIG. 10B ).
- a plurality of circular images 400 a to 400 e formed with the width W of the pin image 40 a as a diameter is filled in the edge contour.
- the first circular image 400 a is tangent with a side of the pin image 40 a
- other circular images 400 b to 400 e are subsequently arranged in the pin image 40 a in order in a tangency manner.
- Step 226 b a first axial position and a second axial position are determined through the plurality of circular images and are used as a geometric center of each pin image with a largest area.
- FIG. 13A is taken as an example.
- the number of the plurality of circular images 400 a to 400 e is an odd number (which is 5 in this embodiment). Therefore, in this embodiment, the manner for determining the geometric center of the pin image with a largest area may be using a center (x, y) of the circular image 400 c corresponding to the median of the plurality of circular images to represent the first axial and second axial position of the pin image.
- FIG. 13B is taken as an example.
- a central point (x, y) of a connecting lines between centers of two circular images 400 c and 400 d in a central region 95 of the plurality of circular images 400 a to 400 f is used to represent the first axial and second axial position of the pin image with a largest area.
- the two circular images in the central region 95 are respectively a ceiling and a floor closest to the median number, and the central point (x, y) of the connecting line between the centers of the two circular images 400 c and 400 d corresponding to the ceiling and floor is used to represent the first axial and second axial position of the pin image with a largest area.
- Step 227 b a formula corresponding to a connecting line formed by connecting centers of the plurality of circular images is obtained, so as to determine a torsion angle of the pin image with a largest area.
- the insertion is not only affected by a distance between adjacent pins but also by the torsion of the pin body. Therefore, in this step, torsion determination is performed on non-circular edge contours.
- the rectangular edge contour in FIG. 13 is taken as an example. It is determined whether the pin is twisted according to a slope of a line segment connecting centers of the circular images filled in the rectangular contour. Therefore in Step 227 b , a formula of the line segment is determined through curve fitting, so as to obtain the slope thereof and a torsion state of the electronic component, thereby determining whether the electronic component can be inserted to the circuit board.
- Step 23 a a position state is determined according to the image position of each pin, so as to determine whether the electronic component is qualified.
- This step is similar to Step 23 FIG. 1 , and the difference is that in this step, apart from the distance between geometric centers of two adjacent pins, the position state also includes the torsion angle of the pin for non-circular pins, so as to determine whether the electronic component can be inserted smoothly.
- the electronic component having a plurality of pins arranged in two rows shown in FIG. 14A , if distances D1 and D2 between geometric centers of two adjacent pins exceed or are lower than an acceptable threshold value or range, the electronic component is unqualified.
- Step 228 b determining the torsion angle according to the slope through a formula formed in a curve fitting manner is the basis for determining a non-circular pin.
- Step 23 a if distances D1 and D2 between geometric centers of adjacent circular pins exceed or are lower than an acceptable threshold value range, and if distances D1 and D2 between geometric centers of adjacent non-circular pins exceed or are lower than an acceptable range or a non-circular pin has a torsion angle ⁇ t , it is determined in Step 24 a that the electronic component is unqualified.
- Step 25 a the electronic component is inserted to a circuit board according to a position relationship between the image positions of the pins and the geometric center of the pick and place device.
- position compensation may be performed according to a distance difference ⁇ x in a direction X and a distance difference ⁇ y in a direction Y between an alignment geometric center 41 of a region formed according to the connecting line of the pins and the geometric center 300 of the pick and place device 30 , and according to an included angle ⁇ between a row of pins and a reference line passing through the geometric center 300 of the pick and place device 30 and parallel to the axis Y.
- the principle thereof is shown in FIG. 9A to FIG. 9C , and is not described herein again.
- pins shown in FIG. 14B are circular pins, however, the same manner applies to non-circular pins.
- FIG. 11B is a schematic flow chart of another embodiment for detecting an image position of each pin according to the disclosure.
- Step 220 c to Step 222 c in the process shown in FIG. 11B are similar to Step 220 a to Step 224 a , that is, at least two images of each pin are selected separately from interest regions of a plurality of serial images for recombination, and each pin image in the recombined image has a largest area.
- edge detection is performed on each pin image in a manner shown in Step 222 b of FIG. 11A , which is not described herein again.
- Step 224 c After the edge contour of each pin is detected, in Step 224 c , a shape of the edge contour is determined. If the edge contour is a circle, Step 225 c is performed, in which a geometric center of each combined image corresponding to a pin is used as an image position of the pin. The manner of Step 225 c is the same as the process shown in FIG. 4B , and is not described herein again. If the pins are polygonal, Step 226 c to Step 228 c are performed to determine whether the electronic component is qualified. The process of Step 226 c to Step 228 c in FIG. 11B is similar to Step 225 b to Step 227 b in FIG. 11A , and the difference is that the image in FIG. 11A is a pin image with a largest area, and the image in FIG. 11B is a combined image; all others are the same, which are not described herein again.
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US20160267636A1 (en) * | 2013-04-11 | 2016-09-15 | Vit | Method or correcting a three-dimensional image of an electronic circuit |
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TW201418731A (zh) | 2014-05-16 |
US20140130341A1 (en) | 2014-05-15 |
CN103813703A (zh) | 2014-05-21 |
TWI493201B (zh) | 2015-07-21 |
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